Question

(b) Out of 200 students in an examination of class IX, 140 passed in Maths, 120 passed in Scien

Answer 1

Answer:

P(A)= probability of who passed maths

=140/200

P(B)= probability of who passed Sci

= 120/200

P(A&B)=(140+120-200+40)/200

P(A|B)'=40/200

Answer 2

Answer:

n(U)=200

n(M)=140

n(S)=120

n(MuS)complement=40

n(MuS)=n(U)-n(MuS)complement

=200-40

=160

n(MnS)=n(M)+n(S)-n(MuS)

=140+120-160

=260-160

=100